code: def iter_examples_filenames(syntax_module):
      for _importer, modname, ispkg in pkgutil.iter_modules(
          syntax_module.__path__
      ):
          if ispkg or modname.startswith("_"):
              continue
          yield modname + ".py"
  
file_path: altair/tests/test_examples.py
imports: import io
  import pkgutil
  import pytest
  import altair
  from altair.utils.execeval import eval_block
  from tests import examples_arguments_syntax
  from tests import examples_methods_syntax
label_desc: Use image node_id 1 for calling a global function with example usage: iter_examples_filenames(syntax_module) without return types